Thanks for that - it makes sense - as stated the Chimney breast is just below/to side of loft so I can’t inspect it from loft, (as it’s a long sloping roof that goes from ground floor at front to two stories at rear of property - and loft is quite high and narrow-) but there’s no sign of damp on...
thanks all for comments - no corbelling I can see on it - its a straight up 1980 stack - gas fire is the fake trad coal type, so not blocking ventilation in any way, I think I'll go with investigating flashing and roof ridge
Just Realised tiles are set in concrete so not lifted easily - when we bought house had L3 building survey done and they thought chimney was ok - but said ridge tiles needed redoing - could this be point of entry for water which is then finding its way down around chimney?
Really appreciate any advice on this as we've just redecorated and replastered and there's more money wasted....both my trades guys seem a bit stumped - brickwork doesn't look bad enough to me to warrant complete rebuild and chimney is not sealed - thankyou
Damp patches, upstairs only, appearing on chimney breast after wet and windy spells - the chimney is not sealed off and there is a gas fire which we disconnected and was not regularly used. After the problem started we had some repointing on stack, and the cement bedding where the pot sits...